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Siderostat pointing: validation of an advanced line-of-sight pointing concept beyond LISA
Classical and Quantum GravityAbstract We present a mechanism prototype for a previously proposed advanced pointing concept for a Laser Interferometer Space Antenna-like space-based gravitational wave observatory that enables an architecture with two bi-directional interferometric laser links per S/C referenced to a single active test mass.
Nils Frederik Hasselmann +6 more
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Gyroless line-of-sight stabilization for pointing and tracking systems
Optical Engineering, 1994A new platform stabilization approach is described where miniature, low-cost, linear accelerometers are used (instead of gyroscopes) for line-of-sight (LOS) stabilization. This is accomplished by placing the accelerometers at strategic locations and combining their outputs so that angular motion is determined from linear acceleration measurements.
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Line of sight pointing technology for laser communication system between aircrafts
Optical Engineering, 2017In space optical communications, it is important to obtain the most efficient performance of line of sight (LOS) pointing system. The errors of position (latitude, longitude, and altitude), attitude angles (pitch, yaw, and roll), and installation angle among a different coordinates system are usually ineluctable when assembling and running an aircraft ...
Yansong Song, Yunqing Liu, Xin Zhao
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Statistical Analysis and Verification of the Satellite Line of Sight Pointing Jitter
2010 First International Conference on Pervasive Computing, Signal Processing and Applications, 2010A method of statistical analysis and verification of the satellite line of sight jitter is discussed. For the case that the jitter measurement is random, the verification of jitter is achieved by estimate the probability that the jitter requirement is not met.
Dong De-zhi +3 more
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Perceptual and Motor Skills, 1977
Near-point and far-point binocular and monocular sighting tests given 240 high and low achievers from regular classrooms at Grades 4, 8, and 12 yielded significant differences by χ3 in distributions of near-point binocular sighting only. Twelfth-grade subjects were significantly different on this test from those in other grades.
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Near-point and far-point binocular and monocular sighting tests given 240 high and low achievers from regular classrooms at Grades 4, 8, and 12 yielded significant differences by χ3 in distributions of near-point binocular sighting only. Twelfth-grade subjects were significantly different on this test from those in other grades.
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Small-Cell Wireless Backhauling: A Non-Line-of-Sight Approach for Point-to-Point Microwave Links
2012 IEEE Vehicular Technology Conference (VTC Fall), 2012In this paper we investigate the feasibility of using microwave frequencies for fixed non-line-of-sight wireless backhauling connecting small-cell radio base stations with an aggregation node in an outdoor urban environment, i.e. a typical heterogeneous network scenario.
M. Coldrey +6 more
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Transportation Research Record: Journal of the Transportation Research Board
It is essential to delineate visual occlusions of head-on traffic signboards under varying available sight distances (ASDs) to improve road safety and guide maintenance. However, the status of sight occlusions in actual road scenarios is unclear because of the lack of an automatic and quantitative evaluation approach.
Jin Wang +4 more
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It is essential to delineate visual occlusions of head-on traffic signboards under varying available sight distances (ASDs) to improve road safety and guide maintenance. However, the status of sight occlusions in actual road scenarios is unclear because of the lack of an automatic and quantitative evaluation approach.
Jin Wang +4 more
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97 GHz point-to-point line-of-sight radio link operating in an urban environment
IEE National Conference on Antennas and Propagation, 1999Communication services operating in the conventional microwave bands are increasingly constrained by spectrum congestion which prevents any further significant expansion of services in this part of the radio spectrum and leads to additional problems of interference between neighbouring systems occupying the same wave bands. The University of Portsmouth
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Line-of-sight-pointing for satellites in high altitude inclined elliptic orbits
IEEE Transactions on Aerospace and Electronic Systems, 2005With a growing demand for space communications and resulting overcrowding of geostationary orbit (GEO), the importance of high altitude inclined elliptic orbits is gaining impetus. However, the satellites in these orbits suffer from a severe problem of apparent periodic angular drift around their line-of-sight.
Kumar K.D., Kumar K.
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Accelerometer based line-of-sight stabilization approach for pointing and tracking systems
Proceedings of IEEE International Conference on Control and Applications, 2002Equipment operating from nonstationary platforms are subjected to angular jitter resulting from vehicle linear and angular motions. The purpose of a stabilized platform is to reject the angular disturbances so that the device modulation transfer function (MTF) is preserved at the system level.
M.C. Algrain, J. Quinn
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